Boiler plug



A. H. WILLETT BOILER PLG June "i7 1924i., 1,498,416

- .Filed June l5.- 1921 2 Sheets-Sheet l y//// A \////l/ll Patented.lune 17, 192.

ALFRED H. WILLETT, 0F WEST NEW YORK', NEW JERSEY, ASSIGNOR T0 AMERICANARCH COMPANY, .A CORPORATION 0F DELAWARE.

BOILER PLUG.

- Application led June'l, 1921. Serial No. 477,625.

To aZZ whom t may concern:

Be it known that I, ALFRED H. WILLETT, a citizen of the United States,residing at West New York, in the county of Hudson and State of NewJersey, have invented certain new and useful Improvements inv BoilerPlugs, of which the following is a specification.

My invention relates to boiler plugs and the like, and my principalobject is to make such plugs secure against accidental blowouts. Suchblow-outs sometimes occur when leaky plugs of locomotive boilers aretightened up while theboiler is under quite low steam pressure, and areoften fatal to the workmen engaged in tightening the plugs. My inventionprevents accidents of this na ture,-even when boiler plugs are screwedso tight as to strip their threads.

How this and other advantages may be obtained through my invention willappear from my description hereinafter of the accompanying drawings,wherein,

Fig. 1 shows an axial cross-section through a boilerJ plug and, theassociated parts by ywhich it is secured in accordance with myinvention.

Fig. 2 is a similar view, showing a modification.

Fig. v3 is a similar view, showing another modification.

Fig. 4 is a similar view showing a further modifcation, the sectionbeing taken as indicated-by the line 4.-4 of Fig. 5.

y Fig. 5 is-a plan view of the construction illustrated in Fig. 4.-.

Fig. 6 shows a vertical longitudinal section through a locomotive firebox, showing the application of my invention to the throat sheet and theback head of the boiler, opposite the ends of a water circulation tube.

Fig. 7 is a cross-section illustrating my invention as employed inconnection with a washout plug. p

In the device or construction shown in Fig. 1, the apertured element 10inV which the plug is secured comprises a lip 12 formed integral withthe boiler plate 13 or the like. This construction is, 1n general,stronger and more l.reliable than if the element v10 were formed as aseparate and distinct part, so lthat I prefer it for new vboilersorboiler plates, where vit is practhe hole in the element 10. The plugmeans 11 shown in the aperture is. an externally threaded plug and isshown as of' the general form usual for boiler plugs, and as having theusual polygonal (squared) stub 16 for engagement by a wrench to turn theplug.A On the exterior of the lip 12 is screwed an internally threadedreinforcement member 17, in the form of a collar with an internalshoulder or Harige 18. The lower corner of this shoulder 18 1s conicallybevelled, in conformity with the bevel of a triangular shoulder orflange 19 on the plug 11.

The plug 11 is secured to the-apertured element 10 even more stronglythan boiler plugs are usually secured, by virtue of the extra extent ofthreaded engagement afforded by the opstanding lip 12. The reinforcementmemberl7 is quite strongly secured to the element 10 around the plug 11,by virtue of the threaded engagement of said member 17 with the lip 12.When, therefore, the collar member 17 is screwed home till its shoulder18 engages the plug at 19, the plug is doubly secured. 0n thekotherhand, the collar 17 is also a means of additionally securing the plug 11when the latter is tightened up Vin service.

for the purpose of stopping a leak. In such during stripping that willprevent any violent shock on the collar threads.

In the device or construction shown in Fig." 2, the apertured element 20is a separa part, and the/lip 12 is integral with said element 20. Atthe root or base of the lip 12, the element 20 has an external flange22. The portion 24 of the element 20 below the flange 22 is externallythreaded and screwed into the hole in the plate 23. As an additionalmeans :of securing the element corresponding to the externally threadedportion 24. The element 30 is secured to the plate 33 byrivets throughthe flange 32, as well as by welding 36 at the outer edge of the latter(as in Fig. 2) and also at the inner edge or lower corner 37 at the baseof the lip portion. rllhe internal threads for engaging the plug 27extend from the top of the lip clear down through the weld 37 and theplate 313. ln all other respects, this construction is like that shownin Fig. 2.

The construction shown in Figs. 4 and 5 closely resembles that of Fig.1, but embodies a solid form of plug 41. rl`his plug 41 is provided witha shoulder 49 for engaging the collar shoulder 18 by the additiontheretoof a locking member 50 of greater diameter than its own, in theform of a 'lat disc. rll`his disc member 50 has a circular opening toreceive the plug stub 56. The plug means, therefore, is in this casecomposite, since the disc member 50 in effect forms part of the plug 41,and its outer portion 49 engages the collar shoulder 18 and secures theplug in the same way Vas does the triangular shoulder 19 of Fig. 1.

ln Fig. 6, the device of Figs. 4 and 5 is shown on the throat sheet 61and the back head 62 of a locomotive lire box 63, opposite the ends ofthe circulation tubes 64 in the fire box. i

ln Fig. 7, the same device is shown applied as a washout plug, at theangle of the structure 70, just as washout plugs of ordinaryconstruction are commonly applied.,

ll claim:

1. A plug device comprising, in combination, an apertured element; plugmeans in the aperture secured to said element and a ring-likereinforcement member detachably secured to said apertured element aroundsaid plug means and engaging the plug mesme lapertured element, saidreinforcement permitting adjustment of the plug. v

3. A plug device comprising, in combination, an internally andexternally screw threaded lip; vexternally threaded plug means screwedinto said lip; and an internally threaded ring-like reinforcement memberscrewed upon said lip, for additionally securing the plug means therein,

said reinforcement permitting adjustment of the plug.

4. A-plug device comprising, in combination, an internally andexternally screw threaded lip; externally threaded plug means screwedinto said lip; and an internally threaded reinforcement member screwedupon said lip having a central opening leaving the plug accessible andan internal shoulder for engaging the plug means and additionallysecuring@ 5. A plug device comprising, in combination, an internally andexternally screw threaded lip; an externally threaded plug memberscrewed into said lip with a locking member associated therewith, saidplug members having wrench engagement means and an internally threadedreinforcement member screwed upon said lip and engaging said lockingmember to secure theplug member but leaving the plug accessible for adnjustment.

6. A plug device comprising, in combination, an internally andexternally screw threaded lip; an 4 externally threaded plug memberscrewed into said lip, with a locking disc of greater diameter than theplug member superposed thereon in `anti-turning engagement therewith;and an internally threaded reinforcement collar screwed upon said lip,therein.

ln testimony whereof, ll have hereunto signed my name. l

ALFRED ll. FNMT@ for additionally securing the plug l

